drop support for compute capability <= 7.0 for newer cuDNN versions #799

Job	Run time
eessi_container_script (run)	2m 27s
eessi_container_script (resume)	2m 31s
eessi_container_script (no_cvmfs_mounts)	2m 51s
eessi_container_script (exec)	2m 18s
eessi_container_script (help)	1m 42s
eessi_container_script (shell)	2m 32s
eessi_container_script (unionfs)	2m 24s
eessi_container_script (listrepos_custom)	1m 22s
eessi_container_script (listrepos_default)	1m 46s
eessi_container_script (container)	2m 22s
	22m 15s

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